Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER

(a) Disconnect the J19 air conditioning amplifier connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J19-1 (IG+) - J19-14 (GND)	B - W-B	Ignition power supply	Ignition switch ON	11 to 14 V
J19-1 (IG+) - J19-14 (GND)	B - W-B	Ignition power supply	Ignition switch OFF	Below 1 V
J19-21 (B) - J19-14 (GND)	GR - W-B	Battery power source	Always	11 to 14 V
J19-14 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
J19-37 (LIN1) - J19-14 (GND)	SB - W-B	LIN communication signal	Ignition switch ON	Pulse generation

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J19-38 (RDEF) - J19-14 (GND)	Y - W-B	Defogger relay	Ignition switch ON, rear window defogger switch off	11 to 14 V
J19-38 (RDEF) - J19-14 (GND)	Y - W-B	Defogger relay	Ignition switch ON, rear window defogger switch on	Below 1 V

2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Disconnect the J127 air conditioning control assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J127-4 (IG+) - J127-5 (GND)	Y - W-B	Ignition power supply	Ignition switch ON	11 to 14 V
J127-4 (IG+) - J127-5 (GND)	Y - W-B	Ignition power supply	Ignition switch OFF	Below 1 V
J127-5 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
J127-7 (STX) - J127-5 (GND)	SB - W-B	LIN communication signal	Ignition switch ON	Pulse generation

Toyota Tundra Service Manual > Front Power Seat Control System(w/ Memory): Wireless Transmitter Memory Function does not Operate
DESCRIPTION With the ignition switch off and the driver door closed, pressing the manual lock or unlock switch on the power window regulator master switch assembly while holding a seat memory switch (M1 switch or M2 switch) will register the transmitter recognition code into the seat memory switch t ...

Toyota Tundra Owners Manual